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PDF ISL28268 Data sheet ( Hoja de datos )
| Número de pieza | ISL28268 | |
| Descripción | (ISL28168 / ISL28268) Micro-power Single and Dual Rail-to-Rail Input-Output (RRIO) Low Input Bias Current Op Amps | |
| Fabricantes | Intersil Corporation | |
| Logotipo |  |
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Data Sheet
ISL28168, ISL28268
September 13, 2007
FN6378.2
34µA Micro-power Single and Dual Rail-to-
Rail Input-Output (RRIO) Low Input Bias
www.Cdautarshreeent4tu.Ocopm Amps
The ISL28168 and ISL28268 are micro-power operational
amplifiers optimized for single supply operation over a power
supply range of 2.4VDC to 5.5VDC. These devices draw
minimal supply current and operate rail-to-rail at the input
and output, while providing excellent DC-accuracy, noise
and output drive specifications. Competing devices seriously
degrade these parameters to achieve micro-power supply
current.
The parts feature an Input Range Enhancement Circuit
(IREC) which enables them to maintain CMRR performance
for input voltages greater than the positive supply. The input
signal is capable of swinging 0.25V above the positive
supply and to 100mV below the negative supply with only a
slight degradation of the CMRR performance. The output
operation is rail-to-rail.
The 1/f corner of the voltage noise spectrum is at 100Hz.
This results in low frequency noise performance which can
only be found on devices with an order of magnitude higher
supply current.
ISL28168 and ISL28268 can be operated from one lithium
cell or two Ni-Cd batteries. The ISL28168 contains an enable
pin feature that allows the device to be shutdown when not in
use.
Ordering Information
PART NUMBER
(Note)
PART
PACKAGE
MARKING (Pb-free)
PKG.
DWG. #
ISL28168FHZ-T7* GACA
6 Ld SOT-23 MDP0038
ISL28168FHZ-T7A* GACA
6 Ld SOT-23 MDP0038
Coming Soon
ISL28268FBZ-T7*
8 Ld SOIC
MDP0027
Coming Soon
ISL28268FUZ-T7*
8 Ld MSOP MDP0043
* “-T7” and “-T7A” suffix are for tape and reel. Please refer to TB347
for details on reel specifications.
NOTE: These Intersil Pb-free plastic packaged products employ
special Pb-free material sets; molding compounds/die attach
materials and 100% matte tin plate PLUS ANNEAL - e3 termination
finish, which is RoHS compliant and compatible with both SnPb and
Pb-free soldering operations. Intersil Pb-free products are MSL
classified at Pb-free peak reflow temperatures that meet or exceed
the Pb-free requirements of IPC/JEDEC J STD-020.
Features
• 34µA typical supply current
• 10pA typical input bias current
• 200kHz gain bandwidth product
• 2.4V to 5.5V single supply voltage range
• Rail-to-rail input and output
• Enable pin (ISL28168 only)
• Pb-free (RoHS compliant)
Applications
• Battery- or solar-powered systems
• 4mA to 20mA current loops
• Handheld consumer products
• Medical devices
• Sensor amplifiers
• ADC buffers
• DAC output amplifiers
Pinouts
ISL28168
(6 LD SOT-23)
TOP VIEW
OUT 1
V- 2
IN+ 3
+-
6 V+
5 EN
4 IN-
ISL28268
(8 LD SOIC)
TOP VIEW
ISL28268
(8 LD MSOP)
TOP VIEW
OUT_A 1
IN-_A 2
IN+_A 3
V- 4
-+
+-
8 V+
OUT_A 1
7 OUT_B IN-_A 2
6 IN-_B IN+_A 3
5 IN+_B
V- 4
-+
+-
8 V+
7 OUT_B
6 IN-_B
5 IN+_B
1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright © Intersil Americas Inc. 2007. All Rights Reserved.
All other trademarks mentioned are the property of their respective owners.
1 page  
ISL28168, ISL28268
Typical Performance Curves V+ = 5V, V- = 0V,VCM = 2.5V, RL = Open (Continued)
1
0
-1
-2 V+ = 2.4V
-3
www.datash-e4et4u.com
-5 RL = 10k
-6 CL = 16.3pF
AV = +1
-7 VOUT = 10mVP-P
-8
1k 10k
100k
FREQUENCY (Hz)
V+ = 5V
1M
8
7
6
5
4
3
2
1
0
-1
-2
-3
-4
-5
V+ = 5V
-6 RL = 10k
-7
-8
-9
AV = +1
VOUT = 10mVP-P
-10
1k 10k
CL = 98.3pF
CL = 72.3pF
CL = 55.3pF
CL = 43.3pF
CL = 34.3pF
CL = 16.3pF
100k
FREQUENCY (Hz)
FIGURE 7. GAIN vs FREQUENCY vs SUPPLY VOLTAGE
FIGURE 8. GAIN vs FREQUENCY vs CL
1M
10
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
10
V+ = 2.4V, 5V
RL = 10k
CL = 16.3pF
AV = +1
VCM = 1VP-P
100 1k 10k 100k 1M
FREQUENCY (Hz)
FIGURE 9. CMRR vs FREQUENCY, V+ = 2.4V AND 5V
10
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
10
PSRR-
PSRR+
V+ = 2.4V
RL = 10k
CL = 16.3pF
AV = +1
VCM = 1VP-P
100 1k 10k 100k
FREQUENCY (Hz)
1M
FIGURE 10. PSRR vs FREQUENCY, V+, V- = ±1.2V
10
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
10
PSRR-
PSRR+
V+ = 5V
RL = 10k
CL = 16.3pF
AV = +1
VCM = 1VP-P
100 1k 10k 100k
FREQUENCY (Hz)
1M
FIGURE 11. PSRR vs FREQUENCY, V+, V- = ±1.2V
1000
100
V+ = 5V
RL = 10k
CL = 16.3pF
AV = +1
10
1 10 100 1k 10k 100k
FREQUENCY (Hz)
FIGURE 12. INPUT VOLTAGE NOISE DENSITY vs FREQUENCY
5 FN6378.2
September 13, 2007
5 Page 
Pin Descriptions
ISL28168
(6 Ld SOT-23)
ISL28268
(8 Ld SOIC)
(8 Ld MSOP)
4
www.datasheet4u.com
2 (A)
6 (B)
ISL28168, ISL28268
PIN NAME
NC
IN-
IN- (A)
IN- (B)
FUNCTION
Not connected
inverting input
EQUIVALENT CIRCUIT
V+
IN- IN+
V-
3 IN+ Non-inverting input
3 (A)
IN+ (A)
5 (B)
IN+ (B)
2 4 V- Negative supply
1
OUT
Output
1 (A)
OUT (A)
7 (B)
OUT (B)
6 8 V+ Positive supply
5 EN Chip enable
Circuit 1
See Circuit 1
V+
CAPACITIVELY
COUPLED
ESD CLAMP
V-
Circuit 2
V+
OUT
V-
Circuit 3
See Circuit 2
V+
Applications Information
Introduction
The ISL28168 is a single CMOS rail-to-rail input, output
(RRIO) operational amplifier with an enable feature. The
ISL28268 is a dual version without the enable feature. Both
devices are designed to operate from single supply (2.4V to
5.5V) or dual supplies (±1.2V to ±2.75V).
Rail-to-Rail Input/Output
Many rail-to-rail input stages use two differential input pairs,
a long-tail PNP (or PFET) and an NPN (or NFET). Severe
penalties have to be paid for this circuit topology. As the
input signal moves from one supply rail to another, the
operational amplifier switches from one input pair to the
LOGIC
PIN
Circuit 3
V-
other causing drastic changes in input offset voltage and an
undesired change in magnitude and polarity of input offset
current.
The ISL28168 and ISL28268 achieve input rail-to-rail
operation without sacrificing important precision
specifications and degrading distortion performance. The
devices’ input offset voltage exhibits a smooth behavior
throughout the entire common-mode input range. The input
bias current versus the common-mode voltage range gives
us an undistorted behavior from typically 100mV below the
negative rail and 0.25V higher than the V+ rail. The CMOS
output stage features excellent drive capability, typically
swinging to within 6mV of either rail with a 100kΩ load.
11 FN6378.2
September 13, 2007
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet ISL28268.PDF ] | |
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